| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a self-collapsing concrete which self-collapses in a relatively short period or can be regulated in the period before self-collapsing. <P>SOLUTION: A method for manufacturing the self-collapsing concrete A includes a step of blending and kneading an aggregate 1 having at least alkaline-aggregate reactivity and an alkaline substance. Since after the concrete is installed in water or the like, the concrete interior can be held at a high alkalinity, the alkaline-aggregate reaction easily progresses and the concrete can be self-collapsed in a relatively short period. In the manufacture step, by subjecting the surface layer of the concrete to a carbonation treatment, the elution of sodium ions and the like can be suppressed and the pH of the surface layer can be neutralized, so plants can well be propagated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
